Three dimensional shape dependent magnetization dynamics in single FePt nanomagnets

We report the dependence of the intrinsic spin wave spectra on the three dimensional shape in single FePt nanomagnetic elements. In contrast to the well known center and edge modes in flat, circular nanodisks, curved nanomagnets with identical nominal thickness and footprint exhibit a rich multimode spectrum with qualitatively different dependence on applied field, such as a low frequency pinned mode. Dynamic micromagnetic modeling shows that the experimentally observed modes originate from different sections of the nanomagnet with vastly different demagnetization fields. Thus, controlled shaping of a nanomagnet in all three dimensions creates the possibility of magnetization dynamics by desig